JPH08315916A - Connector for high-speed transmission - Google Patents

Abstract

PURPOSE: To provide a connector having high density as well as an excellent high-speed transmission characteristic, and further having the capability of preventing a shortcircuit across each contact. CONSTITUTION: Signal contacts 6a to 6d and grounding contacts 7a to 7d are alternately pressed in and fixed to a housing 4, and an alignment board 5 is assembled with each solder lead section 10. Also, an aperture section has a two-row connecting structure, and each contact is kept in contact with a flexible circuit board 2 having contact surface at both sides. Thus, an elastic contact point section 8 has a four-row structure. Also, each contact is classified into two types at the contact point section 8 and a contact pressed-in section 9 for changing the four-row structure to an eight-row structure at the section 9. Furthermore, the solder lead section 10 from the section 9 to the mounting hole of a circuit board 3 is slantwise shortened in electrical length and advantageous for high-speed transmission. Also, a resin sheet 11 is laid between each contact at the section 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector, and more particularly to a high-speed transmission connector attached to a circuit board for use.

[0002]

2. Description of the Related Art In a conventional connector, FIGS.
As shown in FIG. 6, there is no distinction between the signal contact and the ground contact, and the plurality of contacts 23 having substantially the same shape are arranged on the housing 21 and the alignment plate 22. In particular, transmission of high-speed signals is not considered, and the connector Users deal with high-speed transmission by selecting pin assignments.

Further, with the trend toward smaller size and higher density of equipment, the density of connectors and the density of mounting holes (through holes) in a circuit board of a connector are increasing. The conventional circuit board connector has a mating part and a solder lead part individually for each contact, and therefore has the same number of solder lead parts as the number of mating parts, so that the density of the connector can be increased. Directly leads to higher density of the mounting holes of the circuit board for the connector.

[0004]

As described above, the conventional connector does not take high-speed transmission into consideration, the contact shapes are substantially uniform, and the mating portion and the solder lead are provided for each contact. Since the parts are provided individually, they have the following drawbacks.

(1) Since the circuit constants (inductance L, capacitance C, resistance R) of each contact cannot be controlled and the characteristic impedance (Z) cannot be controlled, it is not suitable for high speed transmission.

(2) When the circuit constant is controlled by the conventional connector, the occupancy rate of the ground contact increases and it is impossible to precisely control it.

(3) Due to the high density of the mounting holes of the circuit board,
The density of wiring between through holes is increased.

Therefore, the present invention aims to improve the above-mentioned drawbacks of the conventional connector, provide a high-density connector having excellent high-speed transmission characteristics, and prevent short-circuiting between contacts.

[0009]

According to the present invention, first, each contact is divided into a signal contact and a ground contact, and the ground contact is formed in a plate shape (or wide) in the contact solder lead portion, and this plate is By arranging the signal contacts and the ground contacts alternately (signal, ground, signal, ground, ...) In the orthogonal direction, a pseudo strip line is formed. Here, a plurality of signal contacts and ground contacts can be arranged in a direction parallel to the ground contact plate. Further, the ground contact is integrated with a contact parallel to the plate.

By adopting this structure, the present invention selects the circuit constant of each contact, the lead width of the signal contact, the distance between the signal contact and the ground contact, and the dielectric constant of the material between the contacts. Can be controlled more easily. As a method of adjusting the dielectric constant between the contacts, the dielectric constant is 1.0 when nothing is inserted between the contacts, and when the resin is filled, the dielectric constant of the resin is used and the resin sheet is used. The dielectric constant can also be adjusted by inserting. The method of inserting the resin sheet is advantageous in that it is easy to manufacture and the circuit constant can be finely adjusted by changing the thickness of the resin sheet or the type of resin.

Further, according to the present invention, since the ground contact is formed in the above-mentioned shape, the occupation ratio of the ground contact does not increase for matching the circuit constants. Further, when connecting the ground contact from the connector to the circuit board, the common ground contact is branched and connected to the circuit board, so that it is not always necessary to provide as many contact solder lead portions as there are contact mating portions. Therefore, by reducing the number of contact solder lead portions with respect to the contact mating portion, it is possible to reduce the number of ground contact mounting holes of the circuit board, and thus the wiring density is reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, two embodiments of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 1 is an overall perspective view of a connector according to an embodiment of the present invention mounted on a circuit board. The connector 1 is connected to the circuit board 3 by soldering, and in the horizontal direction of the circuit board 3, an opening for a mating portion of a mating connector is provided, and the opening of this embodiment has two rows of connections. It is structured. A flexible circuit board (FPC) 2 having a contact surface with a connector is a typical counterpart circuit board.

2 (a) and 2 (b) are sectional views of a connector according to an embodiment of the present invention. Signal contacts 6a-
6d and the ground contacts 7a to 7d are press-fitted and fixed to the housing 4, and the aligning plate 5 is incorporated in each contact solder lead portion 10. The signal contacts and the ground contacts are alternately arranged in order from the bottom. The openings have a two-row connection structure, the flexible circuit board 2 has contact surfaces on both sides, and each contact contacts both surfaces of the flexible circuit board 2 and is therefore elastic. The section 8 has a four-row structure. As shown in FIGS. 2A and 2B, each contact is divided into two types in the contact contact portion 8 and the contact press-fitting portion 9, whereby the contact press-fitting portion 9 has a four-row structure. Converted to column structure. A crank-shaped bent portion 15 is provided between the contact contact portion 8 and the contact press-fitting portion 9 of some of the signal contacts and some of the ground contacts, and other signal contacts and other ground contacts. Has no such bend. The contact solder lead portion 10 from the contact press-fitting portion 9 to the mounting hole of the circuit board 3 is slanted to reduce the electrical length. This is advantageous for high speed transmission. Further, the contact solder lead portion 10 also has a structure of eight rows (see FIG. 8).

FIG. 3 is a top view taken along arrow A in FIG. 2 (b). The ground contacts 7a to 7d have a plate-like structure integrally formed in the direction of the arrow in FIG. 3, and each contact end has a contact portion and a solder lead portion. Further, in order to secure the circuit board wiring, the solder lead portions are provided at a pitch twice that of the contact portions. On the other hand, the signal contact 6
In a to 6d, the contact points and the solder lead sections are the same in number as in the conventional case, but in order to secure the circuit board wiring, pitch conversion is performed from the press-fit section to the solder lead section for the two types. There is.

FIG. 4 is a side view taken along the arrow B in FIG. 2 (b). A space for pressing the shoulder 16 of the contact press-fitting portion is secured so that the ground contacts 7a to 7d can also be press-fitted and assembled.

FIG. 5 is a block diagram of FIG. 2 in one embodiment of the present invention.
It is a figure of other examples of the present invention equivalent to the top view of arrow A of (b). The ground contacts 7a to 7d have a wider plate shape than the signal contacts 6a to 6d, and each contact end has a contact portion and a solder lead portion. The ground contact of another embodiment has a narrower plate than the ground contact of one embodiment. Also,
The signal contact of the other embodiment is linear, whereas the signal contact of one embodiment is bent.

FIG. 6 is a block diagram of FIG.
It is a figure of other examples of the present invention corresponding to a side view of arrow B of (b). Shoulder 1 of the contact press-fitting portion is also provided so that the ground contacts 7a to 7d can be press-fitted and assembled.
A space for pressing 6 is secured.

FIG. 7 is a sectional view taken along the line C--C of the contact contact portion of FIG. 2 (b). As shown in the figure, the contacts are alternately arranged in columns and rows in the form of “signal, ground, signal, ground, ...”, and have excellent crosstalk characteristics between adjacent signals.

FIG. 8 is a sectional view taken along line DD of the contact press-fitting portion of FIG. 2 (b). As shown in the figure, the structure has eight rows, and in this cross section, the contacts are also
"Signal, ground, signal, ground, ..." are alternately arranged, and the crosstalk characteristic between adjacent signals is excellent. Further, as can be seen from the figure, since the contacts are provided in a straight line in the lateral direction, they can be integrated.

FIG. 9 is a sectional view taken along the line EE of the contact solder lead portion of FIG. 2 (b). The ground contacts 7, which are individual in the cross section along the line D-D, are formed into an integral plate shape for each row, and the signal contacts 6 are sandwiched to form a pseudo strip line. The width W of the signal contact 6 and the distance h between the contacts can be set freely. Thereby, in this cross section, the circuit constant can be set particularly precisely, and the strip line excellent in high frequency characteristics can be obtained. A resin sheet 11 is incorporated between both contacts. This helps to adjust the circuit constant and prevent short circuit between both contacts.

FIG. 10 is a plan view of a part of the signal contact mounting hole 12 and the ground contact mounting hole 13 in the circuit board of the connector of the embodiment of the present invention. FIG.
As described above, since the hole pitch of the ground contact is twice as large as the hole pitch of the signal contact, a portion where the wirable area of the circuit wiring 14 is wide is obtained at a constant pitch as shown in the figure. This leads to a reduction in wiring density between holes.

[0023]

As described above, according to the present invention, the signal contact and the ground contact are separated and the contacts are alternately arranged, and the ground contact is integrated into a plate shape while converting the connector arrangement. Has changed,
The following effects are obtained.

(1) A connector having a high density and excellent high-speed transmission characteristics can be obtained.

(2) By incorporating a resin sheet between the signal contact and the ground contact, the circuit constants of both contacts can be adjusted at the designing stage and the manufacturing stage, and a short circuit between both contacts can be prevented. Also useful for.

(3) By integrating the ground contact, it is possible to reduce the number of contact solder leads with respect to the contact point of contact, and therefore the number of ground contact mounting holes can be reduced. The wiring density of the circuit board can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a connector according to an embodiment of the present invention is installed on a circuit board.

FIG. 2 is a cross-sectional view of a connector according to an embodiment of the present invention,
(A) shows one cross section, (b) shows another one cross section.

FIG. 3 is a top view of arrow A in FIG. 2 (b).

FIG. 4 is a side view of arrow B in FIG. 2 (b).

5 is an arrow A of FIG. 2 (b) in one embodiment of the present invention.
FIG. 6 is a view of another embodiment of the present invention corresponding to the top view of FIG.

FIG. 6 is an arrow B of FIG. 2B in the embodiment of the present invention.
FIG. 8 is a view of another embodiment of the present invention corresponding to the side view of FIG.

FIG. 7 is a cross-sectional view taken along the line CC of FIG.

FIG. 8 is a cross-sectional view taken along the line DD of FIG.

9 is a cross-sectional view taken along the line EE of FIG. 2 (b).

FIG. 10 is a plan view of a part of the signal contact mounting hole and the ground contact mounting hole in the connector mounting circuit board according to the embodiment of the present invention.

FIG. 11 is a cross-sectional view of a conventional connector.

12 is a side view taken along the arrow F of FIG.

[Explanation of symbols]

 1 Connector 2 Flexible Circuit Board 3 Circuit Board 4 Housing 5 Alignment Board 6, 6a-6d Signal Contact 7, 7a-7d Ground Contact 8 Contact Contact Section 9 Contact Press-In Section 10 Contact Solder Lead Section 11 Resin Sheet 12 Signal Contact Mounting hole 13 Ground contact mounting hole 14 Circuit wiring 15 Bending part 16 Shoulder

Front page continuation (72) Inventor Toshi Kishimoto 1-6, Uchisaiwai-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corp. (72) Katsumi Kaizu 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nihon Telegraph Phone Co., Ltd.

Claims (5)

[Claims] 1. In a high-speed transmission connector having a plurality of contacts, a signal contact and a ground contact are distinguished from each other, and the ground contact has a plate-shaped integrated portion in the same row, and the signal contact is A high-speed transmission connector, which is arranged between the plate-shaped portions of the ground contacts. 2. The high-speed transmission connector according to claim 1, wherein a shoulder portion for press-fitting is provided on a plate-shaped portion of the ground contact. 3. A crank-shaped bent portion is provided between a contact contact portion and a contact press-fitting portion on some contacts,
Other contacts do not have crank-shaped bends,
In the state where some contacts and other contacts are alternately assembled in the housing in the thickness direction of the contact,
A connector for high-speed transmission, wherein the contact portion and the press-fitting portion of each contact exchange the arrangement in the contact plate thickness direction. 4. A high-speed transmission connector characterized in that a resin sheet is incorporated between each contact in a contact solder lead portion. 5. A plate-shaped integral contact has a contact portion at one end and a solder lead portion at the other end, and the number and pitch of the contact portion and the solder lead portion are different from each other. High-speed transmission connector.